I can't seem to reproduce this error. It just happens out of the blue...

One thing to note is:

An action was blocked in combat because of taint from CensusPlus - VoiceChatTalkers:Show()

I was indeed in combat, actually I was just getting about to drop combat and loot the mob when C+ started its normal auto scan, and as usual the window popped right up. I figured there would of been some error because of the new colors in the who window. After this error appears only the first line is colored with the appropriate class, all others are shown in white color.

I do indeed have a ton of mods installed, so maybe they might be interfering? But the taint.log that generates only shows C+ as being the culprit.